Burglar-alarm



(N0 Model.)

J. ISRAEL.

BURGLAR ALARM.

Patented July 17, 1888.

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JOHN ISRAEL, OF ST. LOUIS, MISSOURI.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 386,135, dated July 17,1888.

Application filed May 21, 1888. Serial No. 274,464.

To aZZ whom, it may concern:

Be it known that I, JOHN ISRAEL, of St. Louis, in the State of Missouri,have invented certain new and useful Improvementsin Burg lar-Alarms, ofwhich the following is a specification, reference being had to theaccompa nying drawings.

My improvements relate to detonating bnrglar-alarms of the class shownin my United States Patents Nos. 193,002 and 224,017.

The object of my present invention is to provide mechanism for trippingthe springplnnger and tiring the alarm mechanism when applied to awindow-sash.

In the accompanying drawings, Figure 1 shows so much of a windowsash,partly in section, as is necessary to exhibit a trip attachment appliedto a sash so as to tire my detonating burglar-alarm, and Fig. 2 is aview of the same at right angles to that shown in Fig. 1.

Referring to the letters upon the drawings, A indicates a hollowcylinder provided with a spring-plunger, B, a fnlininate-slot, O, and astandard, D, all substantially as shown in my said patent, No. 193,002.

S indicates a trip attachment to be used in connection with my saidburglar-alarm when applied to a window-sash. It consists of a plate, T,which may be screwed to any suitable part of the sash. This plate isprovided with a shoulder, U, and has pivoted to it an arm, V, rounded atV, so that it will turn a quarter of a revolution, and then be stoppedby the shoulder, in the manner of half-opening or half-shutting ajackknife. The arm V (N0 model.)

(see Fig. 1) projects out over the springplunger of the alarm mechanism,which latter is secured upon a horizontal upper part of the lowersash-frame, as illustrated, so that when the alarm mechanism is set andan attempt is made to raise the lower half of the windowsash thespring-plunger willstrike against the projecting arm and disengage itand fire the fulminate, giving an alarm. The arm V is pivoted loosely tothe plate '1, so that when the burglar-alarm is not set for operationthe arm will drop down by force of gravity out of the way of raising thelower sash, as indicated in dotted lines in Fig. 1.

\Vhat I claim to be new, and desire to secure by Letters Patent of theUnited States, is

The combination, with the springplunger of a detonating burglar-alarm,of a trip attachment for use upon a window sash, consisting of the plateT, adapted to be screwed to the vertical part of a sash and providedwith a shoulder, U, and the arm V, pivoted loosely to the plate androunded at \V, so as to turn a quarter of a revolution and be stopped bythe shoulder U, the arm V also adapted to be set so as to project overthe springplunger of the alarm mechanism and cause it to operate when awindow is raised, substantially as set forth.

In testimony whereof I have hereunto subscribed my name.

JOHN ISRAEL.

vVitnesses:

JACOB BowER, J. T. HOOK.

